[web] fix option require error in otbr-web (#451)
[web] fix option require error in otbr-web (#451)

The typo is fixed and now -v option could correctly print version information.
bukepo/borderrouter,jwhui/borderrouter,openthread/borderrouter,jwhui/borderrouter,jwhui/borderrouter,openthread/borderrouter,openthread/ot-br-posix,openthread/ot-br-posix,openthread/ot-br-posix,openthread/ot-br-posix,openthread/borderrouter,jwhui/borderrouter,openthread/borderrouter,bukepo/borderrouter,openthread/borderrouter,bukepo/borderrouter,openthread/ot-br-posix,bukepo/borderrouter,bukepo/borderrouter,openthread/borderrouter,jwhui/borderrouter,openthread/ot-br-posix